Card is no good for an obelisk deck, despite what Konami said.
It's low def stats means it probably wont survive the attack that flips it up. You'll take 2,000 lifepoints to summon 2 more D-Boyz, then what?
Next turn you'll still have to summon a monster to have enough material for Obelisk, but wait, now you can't normal summon anymore.
To get the best use out of him, you'll need to protect him to use his effect during your own turn. However, this proves to be troublesome in an Obelisk deck, as trap cards aren't usually heavy in an Obelisk deck, as they lower consistency.
Sure, you could do some Xyz or Synchro shenanigans, but will it be worth the 2,000 points of damage you just lost? Mind you, you could easily spend those 2,000 on Warning instead. Dear sweet baby jesus I hope you weren't planning on running Warning and Judgement in the same deck!
Sure it's Dark and Fiend, but it just isn't that great in my opinion.
Edit::: The only way I can see this card becoming any good is if a "D-Boyz" Archtype is released, seeing how it allows you to Special Summon ANY amount of "D-Boyz" from the deck.